Page flip is a very impressive features in displaying your documents, images, media, etc.. The technique behind page flip is pretty complicated. Below is the page flip live application & source code link.
[silverlight: https://pixytech.com/rajnish/uploads/code/PageTurn/App/PageFlip.xap, 688, 555]
You can download the source code here (VS 2010).
I could not spare much time to write implementation notes , however, Rick Barraza has a very good articles describing all the mystery behind this technique in his post. The code is based on his article and can be further extended to create silverlight generic control which could even flip silverlight pages, documents, images etc.
Another page flip (book) control is available here